It might come as news for some but what does Beard Oil actually do? Why do we need it? Firstly; a little bit of science. Each beard follicle has a pair of glands called the sebaceous glands. These glands enable your beard to stay nourished by secreting called sebum oil. As your beard follicle gets longer it demands more sebum oil to coat the follicle. This is why we apply beard oil, to act as a sebum oil and nourish and moisturise the hair follicle.